Oil filter



May 2Q, w41. E. w. AUSTIN OIL FILTER Filed Feb. 2l, 1938 .um Pw. au .T W mw Wy 5. 4 www@ l l Il PatentedMay 20, 1941 OIL FILTER,

Ellsworth W. Austin, Cedar Rapids, Iowa, as-

signor to LaPlant-Choatc Manufacturing Cc. Inc., Cedar Rapids, Iowa, a corporation o:

Delaware Application February 21, 1938, Serial No. 191,633

9 Claims.

One object of my present invention is to provide an inexpensive oil strainer or iilter structure in combination with an oil tank, the structure including a filter assembly which is readily removable for cleaning purposes and replaceable Within an intake chamber of the structure.

`Another: object thereof is to provide a lter structure particularly adaptedA for use inconnection with an oil reservoir of 'a hydraulic mechanism such as a jack or the like, fiuidpressure being supplied to the jack in the form of oil under pressure pumped by. an-oil pump.

Another object is to provide an oil strainer or lter structure in which a strainer assembly is mounted so that oil either from a return or intake tube or from a ller -tube passes through the strainer, the strainer preferably being provided with a lower portion of line mesh and an upper portion of coarse mesh, so that the oil normally is strained through the ne mesh portion, but if this portion becomes clogged, it can 'ow through the coarse mesh portion until such time as the strainer is removed and cleaned.

Still another object is to provide a baille ar' rangement so that if the quantity o1' oil passing through the strainer isin excess of that which the strainer will pass. the oil can rise over the baiiie and bypass the strainer without causing back pressure on the return tube.

A further object is to provide a reservoir tank with an intake chamber in which the strainer is removably positioned, a retainer lever being biased to normally retain the strainer in position and the intake chamber constituting a :Killer tube lfor the tank which tube is provided with a removable cover so that additional oil can be introduced into the reservoir tank when desired,

a deiiector plate being arranged within the intake chamberto prevent return oil from a return tube connected to the intake chamber from passing out through the open ller :'tube when the supply of oil for the reservoir is replenished while the filter structure is in operation.

Still a further object is to provide, in connection with a reservoir tank and lter structure,- a breather tube which is located remotely from. the strainer assembly, a baffle plate `being provided in the reservoir between the strainer lassembly and the breather tubei'to prevent any undesirable splashing of oil out through the breather tube.

With these and other objects in view my invention consists in 4the construction, arrange mentand combination oi the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, in which:

Figure 1 is a plan view of an oil strainer of iilter structure embodying my invention, part of the top of the oil tank being broken away and certain walls thereof being shown in section.

Figure 2 is a sectional view on the line 2--2 of Figure 1 and in connection with this gure, hydraulic mechanism is shown diagrammatically.

Figure 3 is an enlarged sectional view on rthe line 3--3 or Figure Zshowing the breather tube construction; and` y Figure 4 is an enlarged plan View of an intake chamber and return tube of the iilter structure.

0n the accompanying drawing I have used. the reference character T to indicate a substantially closed oilvreservoir or tank. The tank T may be formed of heavy sheet metal plates welded together to make the tank liquid tight. Brackets l@ are welded to the bottom of the tank whereby the tank may be mounted in position as on a tractor or the like.

An intake chamber C is provided within a ller tube i2. The tube i2 is welded in an opening .i3 in the top ci the tank T. Communicating with one side oi 'the ller tube l2 is an intake or return tube 8f3. Within the tube l2, I provide i ai having perrcranens se in the wan thereof.

An imperforate bottom i9 is provided :for the cylinder i? while at its upper end an out-turned .supporting ange'fdg is provided. The ange 20 is adapted to rest on the partition ,i5 surrounding the opening li therein.`

For normallyretaining the strainer assembly S in position I provide a retainer lever 2| pivoted as on a pin 22. of spring wire, coiled about the pin 22 as at 23 and terminating in an arm 24 engaging the side oi the filler tube l2 so as to bias the lever 2| into engagement with the flange 20. A cross member 25a of the lever 2l can -be engaged by the ngers of the operator and the lever thereby swung' to the dotted line Vposition of Figure 2 when it is desirable to remove the strainer assembly S for the purpose of cleaning it or replacing it with an new one.

The pin 22 is supported in ears 25 extending upwardly at the -ends of a detlector plate 28. The deflector plate 25 is mounted in the filler The lever 2| may be made tube I2 in such position that it deects oil eni tering from the return'tube Il downwardly into prevents splashing of oil from the return tube I4 out ofthe top of the filler tube I2 when the ller 'tube is open for the purpose of pouring additional oil into the tank T. The top of the tube I2 is normally closed by a illler tube cap 21 which is illustrated as being screwed thereon.

The supporting flange 20 of the strainer assembly S is cut away as indicated at 28 (see Figure 4) to clear the left-hand edge of the deectorplate 26 which has been shown broken away at 26a to illustrate the cut-away edge 28. Such clearance is necessary during the removal and replacing of the strainer assembly.

A breather tube 29 is welded to the top of the tank-T at a position remote from the top of the filler tube I2. A cover plate 30 is provided for the breather tube which is normally held in position by a nut 3I secured to a bolt 32. The head of the bolt is welded to thevtop of the. tank'T.

The breather tube 29 has vent -openings in the form of notches 33 in the upper edge thereof.

Communication between the breather tube and the interior of the tank is afforded by openings 34 in the top of the tank. Between the breather tube 29 and the strainer assembly S, I provide a baille wall 35 which, as illustrated by dotted lines in- Figure 1, terminates short of one side of the tank to provide oil and air'communication between one compartment 36 of the tank containing the strainer assembly and another compartment 31 thereof communicating with the breather tube.

The lter structure described is adaptable for v use in connection witha hydraulic jack J such as the type used in earth moving machines or snow v plows for raising bulldozer or snow plow blades lor the like. The jack is shown diagrammatically .in Figure 2 and comprises a cylinder having a.

piston 39 therein connected with an operating Y stem 40. Oil is supplied from the tank 'If 'through .a suction port 4I thereof to a pump P and returns through a valve V to the return tube I4. The valve V can be rotated a fourth revolution to the right for causing the piston 29 to move upwardly or a fourth revolution to the left to cause it to' rest by the valve V when in its closed position.

, My strainer or -lter structurels particularly. adapted for the types of machinesmentioned BS.'

' move downwardly. When the valve is in the 12o-X50v it can be ruggedly constructed and the filter itf self is mountedA out of the way and protected from damage by being*v enclosed within the tank T. The. strainer assembly, however, is readily removable for the purpose of being cleaned when it Abecomes v` clogged while the same vtube through which it is removed can be use'd as a filler tube.v

e' -The-deflector 26A serves the purpose of 'normallyv deflecting oil as desired to pass through a fine mesh lower'po'rtion of the strainer assembly S as shown by' the solid line larrows of Figure 2.;

If this portion of the strainer assembly becomes clogged, the oilcan pass as indicated by the dash line`arrows through a coarse mesh portion 44 of.

the strainer. Ifthe mesh 44 also becomes clogged or if more oil is discharged into the intake cham,

ber CY than will pass through .the strainer, some of the oil will be discharged as 'indicated by the dotted line arrows (see also Figure 4) over'bale v I A plates 45 mounted in the intake chamber C. These plates extend upwardly from the partition plate I5 and the partition has bypass openings 46 through which the overflowing oil can pass back into the tank T, Likewise when filling the tank T through the ller tube I2, excessive oil is taken care of by flowing over the bafIles 45.

Oil used in connection with hydraulic jacks of the character mentioned is -usually quite heavy and this is particularly true in cold weather. Provisiqn has been made in my devicewhereby the bypass openings i6 take care of excess oil when its viscosity is such that the strainer S cannot pass all'the oil that pours into it. 'I'he breather tube 29 takes care of changes in volume of the oil caused by temperature changes and by displacement of the piston rod 40, etc., without permitting oil pumped from the pump P to splash out thru the breather tube. The breather tube is mounted remote frgm the strainer for this purpose and the baiiie wall 35 is provided asa means to aid in the prevention of oil splashing out through the breather tube.

Some changes may be made in the construction and arrangement of the parts of my-device Without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims, anyl modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention: l

.1. In an oil strainer structure, an intake chamber having a partition therein, a first opening in said partition, a strainer assembly inserted through said first opening in said partition and supported relative thereto, said strainer assembly being thereby removable from said first opening in said partition, an`intake tube communicatingy with said intake chamber, a baffle within said intake chamber, extending upwardly from said partition, said rst opening being in front of said 'tition therein', an opening in said partition, a

strainer assembly, an intake tube communicate ing with said intake chamber, said strainer assembly being removable from said opening in said A partition and a retainer pivotally mounted in said intake chamber and biased to engage said strainer f assembly. and thereby normally retain it i`n `position, said vretainer being swingable to a position' .permitting removal of said strainer assembly.

3. In an oil strainer, an intake chamber, a cap therefor, a strainer assembly having an'intake in said intake chamber, an intake -tube communieating with said intake chamber,. a retainer biased to engage said strainer assembly and thereby normally retain it in position, said re-- tainer being-swingable to non-retaining position when said cap is removed, a'baille within said intake chamber and extending upwardly `from said strainer assembly,l said intake chamber having an opening back of said baiile for bypassing oil from said intake chamber around said strainer assembly and said strainer assembly being mounted in front of said baille.

4. In ank oil filterstructure, an' oil tank, a tubular intake chamber therefor, a strainer assembly.. zmording communication between said intake chamber and said 'tank and a battle plate withiny said tubular intake chamber and arranged as a chord thereof, said intake chamber having an opening back of said baffle for bypassing oil from said intake chamber to said tank when the quantity of cil entering said intake chamber is in excess of the amount said strainer is capable of passing and said strainer being located in front of said baffle. 4

5. In a strainer structure of the character disclosed, an oil tank, an intake chamber therefor and a strainer assembly providing communication between said intake chamber and said tank, said strainer assembly having a lower portion of ne mesh and an upper portionof coarse mesh.

6. In a strainer structure of the character disclosed, an oil tank, an intake chamber therefor,

a strainer assembly providing communication be- V tween said intake chamber and said tank, said intake chamber constituting a ller tube for said tank, a cover-for said filler tube, said cover being located over said strainer assembly, a bafe within said intake chamber at the vside of said strainer assembly. said intake chamber having an opening on the side of said baflle opposite said strainer assembly for bypassing oil from said intake chamber to said tank when the quantity of oil entering said intake chamber is excessive.

7. In a strainer structure, an oil tank, an intake chamber therefor, a strainer assembly providing communication between said intake chamber and tank, said strainer assembly having a lower portion of fine mesh and an upper portion of coarse mesh, and a bae within said intake chamber, said intake chamber having an opening back of said baille for bypassing oil from said lintake chamber to said tank when the oil entering said intake chamber is in excess of the amount said strainer is capable of passing.

8. In a strainerstructure of the character disclosed, an oil tank, an intake chambervtherefor,

a strainer assembly providing communication between said intake chamber and tank, said intake chamber constituting a ller tube for said tank, a cover for said filler tube, said cover being located over said strainer assembly whereby it receives oil poured through said filler tube, an

4 intake tube connected with the side of said intake chamber, a deiiector positioned Within said intake chamber to deect oil from said intake tube toward said strainer assembly and prevent discharge of oil from said intake tube out through said ller tube, a breather tube communicating with said tank, said breather tube being remotely spaced from said strainer assembly, a baffle plate between said strainer assembly and said breather tube, said breather tube comprising a cylindrical member surmounting the top of said tank, perforations in said breather tube Within the outline of said cylindrical member and acover for said cylindrical member, said cylindrical member having notches in its upper edge for porting the interior of said cylindrical member to atmosphere.

9. In a strainer structure of the character disclosed, an oil tank, an intake chamber therefor,

a strainer assembly providing communication between saidintake chamber and tank, said intake chamber constituting a ller tube for said tank,

a cover for said ller tube, said cover being 1ocated over said strainer assembly, an intake tube connected with the side of said intake chamber, a deflector positioned within said intake chamber to deect oil from said intake tube toward said strainer assembly and -prevent discharge of oil from said intake tube outI through said filler tube, a breather tube communicatingwith said tank, said breather tubebeing remotely spaced from said strainer assembly and a baille plate between said strainer assembly and said breather tube.

ELLSWORTH W. AUSTIN. 

